Machina Fortress is a character version of the card, "Machina Fortress". It appears in the video game Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus. This opponent is unlocked after successfully Synchro Summoning "Odin, Father of the Aesir". You can also unlock Machina Fortress as a Turbo Duel Opponent after successfully Special Summoning "Machina Force".